On 22-09-23, 10:15, Lizhi Hou wrote: > Hello, > > The QDMA subsystem is used in conjunction with the PCI Express IP block > to provide high performance data transfer between host memory and the > card's DMA subsystem. > > +-------+ +-------+ +-----------+ > PCIe | | | | | | > Tx/Rx | | | | AXI | | > <=======> | PCIE | <===> | QDMA | <====>| User Logic| > | | | | | | > +-------+ +-------+ +-----------+ This should be in patch description as well > > Comparing to AMD/Xilinx XDMA subsystem, > https://lore.kernel.org/lkml/Y+XeKt5yPr1nGGaq@matsya/ > the QDMA subsystem is a queue based, configurable scatter-gather DMA > implementation which provides thousands of queues, support for multiple > physical/virtual functions with single-root I/O virtualization (SR-IOV), > and advanced interrupt support. In this mode the IP provides AXI4-MM and > AXI4-Stream user interfaces which may be configured on a per-queue basis. > > The QDMA has been used for Xilinx Alveo PCIe devices. > https://www.xilinx.com/applications/data-center/v70.html > > This patch series is to provide the platform driver for AMD QDMA subsystem > to support AXI4-MM DMA transfers. More functions, such as AXI4-Stream > and SR-IOV, will be supported by future patches. > > The device driver for any FPGA based PCIe device which leverages QDMA can > call the standard dmaengine APIs to discover and use the QDMA subsystem > without duplicating the QDMA driver code in its own driver. > > Changes since v4: > - Convert to use platform driver callback .remove_new() > > Changes since v3: > - Minor changes in Kconfig description. > > Changes since v2: > - A minor change from code review comments. > > Changes since v1: > - Minor changes from code review comments. > - Fixed kernel robot warning. > > Nishad Saraf (1): > dmaengine: amd: qdma: Add AMD QDMA driver > > MAINTAINERS | 9 + > drivers/dma/Kconfig | 13 + > drivers/dma/Makefile | 1 + > drivers/dma/amd/Makefile | 8 + > drivers/dma/amd/qdma-comm-regs.c | 66 ++ > drivers/dma/amd/qdma.c | 1187 ++++++++++++++++++++++++ > drivers/dma/amd/qdma.h | 269 ++++++ > include/linux/platform_data/amd_qdma.h | 36 + > 8 files changed, 1589 insertions(+) > create mode 100644 drivers/dma/amd/Makefile > create mode 100644 drivers/dma/amd/qdma-comm-regs.c > create mode 100644 drivers/dma/amd/qdma.c > create mode 100644 drivers/dma/amd/qdma.h > create mode 100644 include/linux/platform_data/amd_qdma.h > > -- > 2.34.1 -- ~Vinod
